1865863628 has 12 divisors (see below), whose sum is σ = 3457335672. Its totient is φ = 878053440.

The previous prime is 1865863621. The next prime is 1865863667. The reversal of 1865863628 is 8263685681.

It is a self number, because there is not a number n which added to its sum of digits gives 1865863628.

It is not an unprimeable number, because it can be changed into a prime (1865863621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13719518 + ... + 13719653.

It is an arithmetic number, because the mean of its divisors is an integer number (288111306).

Almost surely, 2^1865863628 is an apocalyptic number.

It is an amenable number.

1865863628 is a deficient number, since it is larger than the sum of its proper divisors (1591472044).

1865863628 is a wasteful number, since it uses less digits than its factorization.

1865863628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27439192 (or 27439190 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 53.

The square root of 1865863628 is about 43195.6436229396. The cubic root of 1865863628 is about 1231.0999102162.

The spelling of 1865863628 in words is "one billion, eight hundred sixty-five million, eight hundred sixty-three thousand, six hundred twenty-eight".